Cat unknown death

Hi my name is caren and my cat name was sauke. He was given to me by my boss, they received him from an older women who was unable to care for him. When i brought him home him months ago, he quickly adapted. He was so loving and very gentle. He loved cuddling and kissing. He also enjoyed sleeping in the bed, either next to my head with his head and paw on me, or under the covers next to me, no matter what he love curling up on you. He was very clingy not mean at all. I was told he was an indoor cat, he enjoyed the window and laying in the door way outside. He never left the yard or went away for long. He would only go outside if i was there and came right back. On friday i went to work and he didn't want to come in, i didn't think anything of it my fiance would be home soon to let him in. When i got home i notice he wasn't around did feel alarmed. I started noticing it was getting later and no sign of him. I went to call him and nothing i decided to go to sleep i would here him if he came to the door. The next morning i still no sign and figured he was lost and i proceeded to look around. I found him laying on the grass from a distance ( few house down) across the street. I wasn't hundred percent positive so i called my fiance and confirmed it was sauke. We gave him a proper burial and he know at a gulf course over looking the the gulf course. When my fiance works. My fiance told me he did not have any broken bones nor blood or foaming. Its strange to me how he was laying there and i still hope that it wasn't sauke. The only other thing we noticed is he was getting too skinny and sauke eat way too much. I would feed him three cans of food big ones and dry food. I was told that was too much but he never threw up. I was told to cut him back. He only ate salmon, tuna he was a bit spoiled, i give him salmon sticks for treat would break it up for him. Please help!!